Testing Ecto Schemas: Validations and Database Integration in Elixir

Testing database logic doesn't have to be slow, complex, or prone to unexpected failures. In Elixir applications, Ecto provides a powerful changeset and schema system, but ensuring your validations, constraints, and database integrations work seamlessly requires a structured testing approach. This course guides you through writing robust, repeatable tests for your data layer. You will transition from guessing if your database constraints work to confidently verifying your data integrity rules using modern testing patterns. You will learn to isolate schema logic from direct database calls, handle complex relationships, and mock data efficiently. What you'll learn: - Understand foundational Ecto schema concepts, changeset pipelines, and the role of data casting - Write unit tests for changeset validations, including custom validation logic and error handling - Test database integration safely using Ecto sandbox pools to run concurrent, isolated test transactions - Validate database-level unique constraints and foreign key constraints within your test suite - Apply modern testing patterns using factories and fixtures to generate clean, maintainable test data - Debug common Ecto test failures, cast errors, and parameter mismatch issues systematically This text-based course starts with fundamental database testing terminology and basic changeset concepts before moving into hands-on testing scenarios. You will read clear explanations, analyze structured code snippets, and study real-world testing patterns that you can apply immediately to your own Elixir projects. This course is designed for beginner to intermediate Elixir developers who want to write reliable database tests. No prior experience with Ecto testing is required, though a basic familiarity with Elixir syntax and database concepts is helpful. Start writing cleaner, more reliable Elixir database tests today.